The chickwts dataset containts of 71 observations of 2 variables (weight, feed).

Newly hatched chicks were randomly allocated into six groups, and each group was given a different feed supplement. Their weights in grams after six weeks are given along with feed types.

Source: Anonymous (1948) Biometrika, 35, 214.

The next slide shows boxplots of the chickwts dataset.

They show the distribution of weights by feed type.